Antioxidant is the enemy of free radicals. It forms a protection layer to prevent cells from being damaged. These are the compounds that can inhibit oxidative stress.
Wholesome plant definitely contains antioxidant, since antioxidant gives the fruits/vege colours and aroma. That's why we need variety of colours and types.
Without antioxidant, the protection layer is removed, and bare cells are easily being mutated/damaged. Look at picture above.
However, please be aware that lots of people are taking antioxidant from pills, e.g. vitamin/multi vitamins. When antioxidant is prepared chemically, or extracted from a wholesome food, it doesn't work the same anymore.
Further, do check out following on where does vitamins come form, and what's the side effects of taking vitamin supplements.
http://www.precisionnutrition.com/all-about-vitamin-supplements
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